Preheat oven to 325 F. Cream butter, sugars and peanut butter. Add eggs. Stir or whisk together flour, soda and salt. Add to creamed butter mixture and mix well. Stir in peanut butter chips. Roll into balls or use a cookie scoop. Cut the chocolate bars in half and place the cut side down on top of the rounded cookie and press down gently. Bake for 10-12 minutes. Remove from oven and leave cookies on cookie sheet for 2 minutes to rest. Slide parchment with cookies onto cooling rack and let cool for ten minutes. Remove from parchment to cooling rack to cool completely. If you try to eat these cookies while still warm they may fall apart. Allow them to cool completely and they’ll be fine.